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AA. E. -LOCKHARL .VALVE SPRING COMPRESSOR.

APP LICAT|0N FILED. OCI. 6, |919.

Reissuedv Apr. 20, 1920.

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ATTORNEYSl UNITED sTATEs PATENT oEEicE.

i ADREWB. LOCKHART, OF REDLANDS, CALIFORNIA.

VALVE-SPRING COFIPRESSOR.

Specication of Ressued Letters Patent. Rissued A131'. 20, 1920.

Original No. 1,266,285, dated May 14, y1918, Serial No. 182,433, filedJuly '24, 1917'. Application for reissue ledOctober 6, 1919. Serie-JNO.328,954. y

To all 'whom it may concern."

Be it knownthat I, vANDREW B.' Loon- HART, a citizenV of the UnitedStates, residing at Redlands, inthe county of San Bernardinoand State ofCalifornia, have inventeda new anduseful Valve-Spring Compressor, ofwhich the following is a specifi'- cation. f

The invention relates to` a valve spring compressor, and moreparticularly tothe class of tools or devices for facilitating theremoval of engine valves.

The primary object of the invention is the provision of a tool ordeviceof this character, wherein the spring for lan engine valve, whichholds the valve upon its seat, can be readily compressed with despatchfor the easy removal of the key from the stem of the valve to permit theextract ing of said valve from its casing, so that the said valve orseat may beconveniently ground.

Another object of the inventionis the provision of a tool or device ofthis character, which can be readily applied and adjusted, and alsowillA be positive in operation, to sustain the spring in any desired degree of compression, without manual exertion for this purpose',l andavoiding the possibility of the bending of the, stem of the valve, thetool being readily operated and the leverage giving a powerfulcompression force and assuring ease in operation.

A furtherobject of the invention is the provision of a tool or device ofthis character, which is extremely'simple in construction, readilyandeasily operated, strong, yet light in weight, durable, thoroughlyreliable and eiiicient in its operation, and inexpensive in manufacture.l A l With these' and other objects inL view, the

invention consists in the features of construction, combination andarrangement of parts, asw-illbehereinafter fully described, illustratedinthe accompanying drawings, and pointed out in the claims' hereuntoappended. However, it is to' be understood that changes, variations*'and modications may be made such as' come properly within the scopeofthe appended claims', without departing' from the spirit of theinvention or sacrificing any of its advantages.

lstructed in accordance with the invention tion.

Fig. 2 is a sectional view on the line 2 2 of Fig. l, lookingy in thedirection of the arrow.

Fig. 3 is aperspective view of the adjustable gib.

Fig. 4l is a fragmentary detail view, showinfl in top plan the forkedend of the lever.

imilar reference lcharacters indicate like parts throughout thev severalfigures.

In constructing a practical embodiment of the invention in accordancewith the illustrated example, the frame 5 is provided, preferablycomprising a single plate which is bentA on itself at opposite endsintosubst'antially U-formation to constitutev guides or cleats '6 and 7,respectively, the plateibel ing preferably cut away, as at 8, at anunoccupied portion or portions to assure lightnessor the reduction' inweight thereof wit-hout weakening the same, and spaced from the guide orcleat 7 on the frame is a raised portion providingv an abutment rib 9,which extends transversely of the plate parallel with the free edge ofthe guide or cleat 7 for a purpose presently described'.

Slidably engaged in the guide orl cleat 7 applied, a portion of thelatter being in secon the frame' is the vertical adjustable leg`cated'at 1'1 to form a forked terminal 12 and adapted, to engage thevertical leg of the arm' 10 is a wedging block 13, which is insertedbetweenv the rib 9 and the edge adjacent thereto of the' arm 1'() whenengaged in the guide or cleat 7, so that the arm can be locked or heldfast in adjusted position. Passed through the block 13 is a bolt 14,which is also passed through the frame- 5 and carried a knurled nut 15,which tightens against the frame 5, and in the use of the bolt and nut,the block 13 can bel wedged between the rib 9 and the vertical leg ofthe arm 10 for securely holding the a-rn in adjusted position, as' willbe4 obvious.

Slida'blyfitted in the guide` or cleat 6' on the frame 5 is a centeringpin 16, which is formed with a toothed rack 17 meshing with a segmentgear 18.` Rotatably journaled at one side of the frame 5, the journal 19of which is passed through the frame, has fixed thereto an operatinghandle 2O at the other side of the frame, so that the gear can bemanually rotated for the operation of the tool or device. Fitted withinthe guide or cleat 6 is anv adjustable gib 21, which, at the endsthereof is formed with right angular ears 22 to engage with oppositeedges of the guide or cleat G at the closed side thereof to preventdisplacement longitudinally of said gib/within the rib or cleat, andthreaded in the closed side of the guide or cleat are square headedadjusting screws 23, which work against the gib 21 for adjusting thesame against the rack endv portion 17 of the centering pin 16, so as totake up wear and assure of the positive meshing of the rack teeth 17with the gear 18, the screws 23 being fitted with lock nuts 24, whichsecure the same in their adjusted position.

In Fig. 1 of the drawing there is illustrated a valve A engaging a valveseat B in the valve casing C, the stem D of the valve B being slidablethrough the casing C and surrounding this stem is the coiled spring Ewhich sustains the valve A closed and engaged in its seat B, the springE being held active upon the stem through the medium of the retainingkey F as usual.

Pivotally mounted on the frame 5 is a dog or pawl 26 for engagement withthe gear 18, so as to lock the same to sustain the arm 10 in raised orlowered position relative to the pin 16 on movement of the frame 5 whenthe handle 20 has been actuated by the user of the device.

Now, in the application of the tool or device, the handle 20 foroperating the gear 1S is brought to the position shown in Fig. l of thedrawing, and the centering pin 16 which at its engaging end is formedwith a point 27 is engaged with the valve A in the center thereof, thepoint 27 being engaged in the usual central depression in said valve toprevent the slipping of the centering pin, and the arm 10 at its forkedextremity 12 receives in the bifurcation 11 the lower end of the stem Dof said valve A, so that the tool vor device is in the positionshown inFig. 1 of the drawing to be operated for compressing the Aspring E forthe removal of the retaining key F from the valve stem D, so that thevalve can be extracted from the valve casing C for the grindin of thevalve or its seat B in said casing. n raising the handle 20, the gear 18is rotated and the frame 5 is moved upwardly on the rack end 17 of thecentering pin 16, it being understood, of course, that the arm 10 issecured in its adjusted position and this movement of the frame upwardlycompresses the spring 4E to a suflicient degree for permitting the easyremoval of the retaining key F from the stem D of the valve A, so thatthe valve can be readily removed from the casing C on releasing the toolor device from the valve and its stem.

From the foregoing, it is thought that the construction and manner ofoperation of the invention will be clearly understood, and, therefore, amore extended explanation has been omitted.

What is claimed is.:-

1. A tool ofthe character describedcomprising a plate-like frame formedwith guide cleats at opposite ends, a substantially L-shaped armslidably received in one of the cleats and having a forked terminal, awedging fastener carried by the frame and engageable with the arm tohold the same in adjusted position thereon, a toothed rack slidable inthe other cleat and having a centering pin, a gear rotatably ournaled onthe frame and meshing with the toothed rack, and a handle for rotatingthe gear.

2. A tool of the character describedcomprising a plate-like frame formedwith guide cleats at opposite ends, a substantially L-shaped armslidably received in one of the cleats and having a forked terminal, awedging fastener carried by the frame and engageable withthe arm to holdthe same in adjusted position thereon, atoothed rack slidable in theother cleat and having a centering pin, a gear rotatably journaled onthe frame and meshing with the toothed rack, a handle for rotating thegear, and an adjustable gib actingv against-the toothed rack and heldWithin the cleat receiving the same.

3. A tool of theV character described comprising a plate-'like frameformed with guide cleats at opposite ends, a substantially L-shaped armslidably received in one of the l cleats andl having a forked terminal,a wedging fastener carried by the frame and engageable with the arm tohold the same in adjusted position thereon, a toothed rack slidable inthe other cleat and having a centering pin, a gear rotatably journaledon the frame and meshing with the toothed rack,

va handle'for rotating the gear, an adjustable gib acting against thetoothed rack and held within the cleat receiving the same, and means forlocking the gear against move-- ment.

4. A tool of the character described, com-I prising a frame formed withguides at opposite ends, a substantially AL-shaped arm slidably receivedin one of the guides and having a forked terminal, a fastener carried bythe frame and engageable with the arm to hold the same in adjustedposition thereon, a toothed rack slidable in the other guide and havinga centering pin, a gear rotatably journaled 0n the frame and meshingwith the toothed rack, and a handle for rotating the gear.

5. A tool of the character described, oomprising a frame formed withguide cleats at opposite ends, a substantially L-shaped arm slidablyreceived in one of the cleats vand having a forked terminal, a fastenercarried by the frame and engageable with the arm to hold the Same inadjusted position thereon, a toothed rack slidable in the other cleatand having a centering pin, a gear rotatably journaled on the frame andmeshing With the toothed rack, and a handle for rotating the gear.

In testimony that I claim the foregoing l5 as my own I have heretoafIiXed my signature in the presence of two Witnesses.

ANDREV B. LOCKHART.

Witneses:

HAZEL E. J ONES, FRANCIS P. MURPHY.

